Python as you know is a very high-level, object-oriented programming language used in everything from web applications to scientific computing. And variables are a core concept in programming. We use variables to store data in a computer's memory.
Variables in Python
Variable is like a reference or label of the memory location. Also, in Python, variables are created when you assign any value for it,
For example, take this sample code, and try
(*we have used keySkillset platform for reference images)
You can see the output you get is
Meanwhile, Python has no command for declaring a variable. A variable is created the moment you first assign a value to it.
Note: Variables do not need to be declared with any particular type, and can even change type after they have been set.
To get an idea, browse through this Sample given:
And the output for this is:
Now, if you want to specify the data type of a variable, this can be done with casting. Try the sample code
And if you run “main” the output you get will be
Also, you can get the data type of a variable with the type() function.
Take the sample code and try the type() function of Python.
Output you get here is:
This is because x is assigned to the integer value 4, which has a data type of ‘int’. On the other hand, y is assigned to the string value "jane", which has a data type of ;str’. Using the type() function allows you to check the data type of a particular variable.
In Python, ‘int’ is short for "integer", and it is a data type that represents whole numbers. int values can be positive, negative, or zero. For example, 1, -5, and 0 are all integers.
On the other hand, ‘str’ is short for "string", and it is a data type that represents a sequence of characters. str values are enclosed in quotes (either single quotes or double quotes) to indicate that they are a string. For example, "hello", 'world', and "123" are all strings.
It's important to note that in Python, each data type has its own set of rules and operations that apply to it. For example, you can perform arithmetic operations (addition, subtraction, multiplication, etc.) on ‘int’ values, but not on ‘str’ values. Conversely, you can perform string manipulation operations (concatenation, slicing, etc.) on ‘str’ values, but not on ‘int’ values.
Now, the string variables can be declared either by using single or double quotes.
The variable names are also case-sensitive. Check the sample code, try and get the output.
‘ As you can see, Python also allows you to assign values to multiple variables in one line. Here is the sample code and output.
At the same time, it is possible to assign the same value to multiple variables in one line. For sample and output, see here:
And to output variables, the print() function is used. Sample code and output for this is also given here.
In the print() function, you can output multiple variables, separated by a comma.
You can also use the + operator to output multiple variables. Run the sample code
For numbers, the + character works as a mathematical operator.
Note: In the print() function, when you try to combine a string and a number with the + operator, you will get an error.
Conclusion
In summary, variables are used to store values that can be referenced and manipulated throughout your code. When creating variables, it's important to choose meaningful names that represent the data they hold. In addition, variables can be used in various ways, such as performing calculations, storing user input, and keeping track of program state. Understanding how to work with variables is a fundamental concept in programming that will help you as you continue to learn and develop your coding skills.
If you want to check out the free access to our Python course, you can check out keySkillset.
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